Hi I am planning to build an authority site by adding at least 2 posts with unique content every day . Now I have 20 posts on my blog. I have few doubts regarding link building. If I build 30 social bookmarks to each post .i.e. each post will have 30 links from social bookmarks sites and 10 links from doc sharing sites & few video links. (All these will be build from different accounts) Is this a good way to build links? Or will it look like spammy to google if I build those links to every post?